1) The concept of federalism involves the division of powers between a central government and regional or local governments, allowing for shared governance and autonomy for different levels of administration.

2) The oldest known musical instrument is a flute made from a bird bone, estimated to be around 43,000 years old.

3) The Eiffel Tower can be 15 cm taller during the summer due to thermal expansion.

4) The Civil Rights Act of 1964 in the United States outlawed discrimination based on race, color, religion, sex, or national origin.